My thanks for all the help and suggestions, and my apologies for all the floundering. Cepstral support spotted the problem pretty quickly.
Evidently somehow I managed to install a 32 bit Debian on this 64 bit PC, but I was attempting to install a 64 bit package on it. Downloading and installing the 32 bit Cepstral package did the trick. It's not been my day. Chuck -- A bicycle can't stand alone; it's just two tired. Willoughby Ohio Temperature 59°F Conditions Mostly Cloudy The Moon is Waxing Crescent (6% of Full)